Rainbow Electronics MAX3799 - Manual (Page 5)

MAX3799
1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V CC = 2.85V to 3.63V, T A = -40°C to +85°C, CML receiver output load is AC-coupled to differential 100 Ω, C
AZ = 1nF, transmitter out-
put load is AC-coupled to differential 100 Ω (see Figure 1), typical values are at +25°C, V
CC = 3.3V, I BIAS = 6mA, I MOD = 6mA, unless
otherwise specified. Registers are set to default values unless otherwise noted, and the 3-wire interface is static during measure-
ments. For testing, the RATE_SEL bit was used and the RSEL pin was left open.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
BIAS Current DAC Stability 2mA
I BIAS
15mA (Notes 2, 10) 4 %
Compliance Voltage at BIAS V BIAS 0.9 2.1 V
BIAS Current Monitor Current
Gain
I BMON
External resistor to GND defines the
voltage gain
16 mA/A
Compliance Voltage at BMON V
BMON
0 1.8 V
BIAS Current Monitor Current
Gain Stability
I BMON 2mA
I
BIAS

15mA (Note 10) 5 %
Tx SAFETY FEATURES
Excessive Voltage at BMON V BMON
Average voltage, FAULT warning always
occurs for V
BMON
 V
CC
- 0.55V, FAULT
warning never occurs for V BMON
V CC -
0.65V
V
CC
-
0.65V
V
CC
-
0.6V
V
CC
-
0.55V
V
Excessive Voltage at BIAS V BIAS
Average voltage, FAULT always occurs for
V
BIAS

0.44V, FAULT never occurs for
V BIAS
 0.65V
0.44 0.48 0.65 V
Maximum VCSEL Current in Off
State
I OFF FAULT or DISABLE, V BIAS = V CC 25 μA
SFP TIMING REQUIREMENTS
DISABLE Assert Time t_ OFF
Time from rising edge of DISABLE input
signal to I
BIAS = I BIASOFF and I MOD =
I MODOFF
1 μs
DISABLE Negate Time t_ ON
Time from falling edge of DISABLE to I BIAS
and I MOD at 90% of steady state when
FAULT = 0 before reset
500 μs
FAULT Reset Time of Power-On
Time
t_ INIT
Time from power-on or negation of FAULT
using DISABLE
100 ms
FAULT Reset Time t_ FAULT
Time from fault to FAULT on,
C
FAULT

20pF, R
FAULT
= 4.7k

10 μs
DISABLE to Reset
Time DISABLE must be held high to reset
FAULT
5 μs
OUTPUT_LEVEL VOLTAGE DAC (SET_CML)
Full-Scale Voltage V FS 100
differential resistive load 1200 mV P-P
Resolution 5 mV P-P
Integral Nonlinearity INL 5mA
I
CML_LEVEL

20mA ±0.9 LSB
LOS THRESHOLD VOLTAGE DAC (SET_LOS)
Full-Scale Voltage V FS 94 mV P-P
Resolution 1.5 mV P-P
Integral Nonlinearity INL 11mV P-P

V
TH_LOS

94mV
P-P ±0.7 LSB
BIAS CURRENT DAC (SET_IBIAS)
Full-Scale Current I
FS
21 mA